I've received an email from Twitter which reads as follows:
Hello Caitlin Johnstone,
Your account, caitoz has been suspended for violating the Twitter Rules.
Violating our rules against abusive behavior.
You may not engage in the targeted harassment of someone, or incite other people to do so. We consider abusive behavior an attempt to harass, intimidate, or silence someone else's voice.
Note that if you attempt to evade a permanent suspension by creating new accounts, we will suspend your new accounts. If you wish to appeal this suspension, please contact our support team.
They're calling it a "suspension", but nobody can view my page and I can't perform any activities on it, and it appears to be permanent unless I succeed in going through the anonymous and unaccountable appeals process. Now when people try to access my account, they get a screen that looks something like this depending on what device they're using: